Indirect-feedback Control of Microwave Hyperthermia System Using Non-invasive Measurement

Abstract

In this paper, a method for non-invasive soft measurement of the heating temperature of human cancer tissue using microwave hyperthermia is proposed. In this way, by measuring the surface temperature of the skin area irradiated by the microwave, the temperature of the cancerous tissue in the body heated by the focused microwave can be estimated. Taking the estimated temperature as the feedback signal, a feedback control scheme for controlling the output power of the magnetron of the microwave hyperthermia instrument is proposed. As a result, the temperature of the cancerous tissue heated by the microwaves can be controlled, and the cancerous cells can be ablated without harming surrounding normal cells and tissue. Then the experimental results of non-invasive indirect measurement are presented. Taking the indirect measurement as the feedback signal, the corresponding generalized minimum variance control results are illustrated.